body,head{
  width: 100%;
  height: 100%;
}
#root{
  width: 100%;
  height: 100%;
}
.box{
  width: 100%;
  height: 100%;
  background: #ccc;
  position: absolute;
  left: 0;
  right: 0;
}
.box>.spin{
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate3d(-50%,-50%,0);
}
